›› 2017, Vol. 38 ›› Issue (5): 1424-1435.doi: 10.16285/j.rsm.2017.05.025

• 岩土工程研究 • 上一篇    下一篇

深部高应力软岩巷道耦合支护效应研究及应用

孟庆彬1, 2,韩立军1,张帆舸1,张 建1,聂军委1,文圣勇1   

  1. 1. 中国矿业大学 深部岩土力学与地下工程国家重点实验室,江苏 徐州 221116; 2. 山东科技大学 山东省土木工程防灾减灾重点实验室,山东 青岛,266590
  • 收稿日期:2015-06-07 出版日期:2017-05-11 发布日期:2018-06-05
  • 作者简介:孟庆彬,男,1985年生,博士,助理研究员,主要从事岩体加固理论与应用技术的研究
  • 基金资助:

    国家优秀青年科学基金(No. 51322401);国家自然科学基金项目(No. 51574223,No. 41572263,No. 51323004);中国博士后科学基金资助项目(No. 2015M580493);山东省土木工程防灾减灾重点实验室开放课题(No. CDPM2014KF03)。

Coupling support effect on high-stress deep soft rock roadway and its application

MENG Qing-bin1, 2, HAN Li-jun1, ZHANG Fan-ge1, ZHANG Jian1, NIE Jun-wei1, WEN Sheng-yong1   

  1. 1. State Key Laboratory for Geomechanics add Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116; 2. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Shangdong University of Science and Technology, Qingdao, Shandong 266590
  • Received:2015-06-07 Online:2017-05-11 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation-Outstanding Youth Scholars (51322401), the National Natural Science Foundation of China (51574223, 41572263, 51323004), the China Postdoctoral Science Foundation (2015M580493), and the Opening Project Fund for Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation) (CDPM2014KF03).

摘要: 巷道要经历开挖前稳定、开挖扰动、支护稳定或再破坏的演化过程,巷道稳定状态受原岩应力场-开挖扰动应力场-支护应力场相互作用的影响。采用FLAC3D分析了不同预紧力与间排距条件下锚杆、锚索产生的围岩支护应力场的分布特征,定义了围岩应力扩大系数k来表征围岩应力的扩散效果,揭示了锚杆、锚索预紧力耦合支护效应。针对朱集西矿深部巷道特征与地质条件,提出了锚网索喷+U型钢支架+注浆+底板锚注分步联合支护技术方案,开展了三维相似材料模型试验,验证了该支护技术方案的合理性与可行性,揭示了深部高应力软岩巷道围岩变形破坏与支护结构受力演化规律,并成功应用于工程实践,解决了深部高应力软岩巷道支护难题。监测结果表明,该联合支护方案有效地控制了深部高应力软岩巷道围岩大变形与底臌,保证了巷道围岩与支护结构的长期稳定及安全。

关键词: 高应力, 软岩巷道, 耦合支护效应, 分步联合支护技术, 相似材料模型试验

Abstract: The roadway experienced the whole evolution process, including the stability before excavation, excavation disturbance and support stability or failure. It is found that the steady state of the roadway was affected by the interaction of the in-situ stress field, excavation-induced stress field and supporting stress field. In this study, the finite difference program FLAC3D was employed to analyze distribution characteristics of supporting stress fields in surrounding rock which were induced by the bolt and anchor cable under different conditions of pre-tightening force and inter-row distance. Furthermore, the coefficient k of rock stress expansion was defined to characterize the stress diffusion effect of surrounding rock. The coupling support effect of the bolt and anchor cable was revealed as well. A new approach was put forward by considering the special geological conditions and engineering characteristics of deep roadway in Zhujixi Mine. This approach was named as a step-by-step combined support technology consisting of cable anchor spraying, U type steel support, grouting, floor anchor and injection. A three-dimensional (3D) similar material model test was conducted to verify the approach, which revealed the deformation and failure of soft surrounding rock and the evolution laws of supporting structure under high stress conditions. This scheme was also successfully applied to a practical engineering project, which solved the support problem of deep soft rock roadway under high stress. The monitoring results indicate that the combined support scheme effectively control the large deformation and floor heave of deep soft rock roadway. Eventually, the long-term stability and safety of the roadway surrounding rock and supporting structure can be guaranteed.

Key words: high stress, soft rock roadway, coupling supporting effect, step-by-step combined support technology, similar material model test

中图分类号: 

  • TD 325

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